William Takaku (died 3 January 2011 ) was a Papua New Guinean film, television and theatre actor. He was also a screenwriter and a former theatre director.
He was for a time director of the National Theatre Company in Papua New Guinea.
He co-wrote, with Albert Toro, and directed the television miniseries Warriors in Transit (1992). Takaku has also directed the Milne Bay Provincial Theatre Group.
As an actor, he co-starred as Man Friday alongside Pierce Brosnan in the film Robinson Crusoe (1997) and he appeared as Magnus in the television miniseries The Violent Earth (1998).